Add new issue templates for backport requests and community issues

.github/ISSUE_TEMPLATE/6_backport request.yml

@@ -0,0 +1,30 @@
+name: "🔙 Backport request"
+description: Create a backport request of a bug fix.
+title: '[Backport] '
+labels: ["backport"]
+
+body:
+  - type: textarea
+    id: backports
+    attributes:
+      label: What would you like to backport?
+      description: "Provide a list of links to PRs or commit SHAs you would like to backport."
+    validations:
+      required: true
+
+  - type: textarea
+    id: graalvm_versions
+    attributes:
+      label: GraalVM versions
+      description: "List the GraalVM versions you would like to see the changes backported to."
+      value: "GraalVM for JDK 21"
+    validations:
+      required: true
+
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Describe the motivation for the backport.
+      description: "Provide a clear and concise explanation of why this backport is needed. If it fixes a reported issue please link to it."
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/7_community_bug.yml

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+name: "🐞 Issue Report for Community Builds 🧑‍🤝‍🧑"
+description: Create a report to help us improve GraalVM's community builds.
+title: '[Community] '
+labels: ["bug", "community-21"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        For security vulnerabilities, please consult the [GraalVM security policy](https://github.com/oracle/graal/security/policy) and contact the security team directly.
+
+  - type: textarea
+    id: describe_issue
+    attributes:
+      label: Describe the Issue
+      description: "Provide a clear and concise description of the issue."
+    validations:
+      required: true        
+
+  - type: textarea
+    id: steps_to_reproduce
+    attributes:
+      label: Steps to reproduce the issue
+      description: "Please include both build steps as well as run steps."
+      placeholder: "1. \n2. \n3."
+    validations:
+      required: true
+**Steps to reproduce the issue**
+Please include both build steps as well as run steps
+1. **[e.g.: `git clone --depth 1 https://git.myrepo.com/projectone` ]**
+2. **[e.g.: `mvn clean package`]**
+
+**Describe GraalVM community build and your environment:**
+ - GraalVM community build:
+   - [ ] Liberica
+   - [ ] Mandrel
+ - GraalVM version, or commit id if built from source: **[e.g. 23.1.4, a4bc8f4ab29529b3133d81a19f752b397cbf45ed]**
+ - JDK version: **[e.g.:21.0.4+7]**
+ - OS: **[e.g. macOS Catalina]**
+ - Architecture: **[e.g.: AMD64]**
+
+**More details**
+Add any other information about the problem here. Especially important are stack traces or log output. Feel free to link to gists or to screenshots if necessary.
+```
+    PASTE YOUR LOG/STACK TRACE HERE
+```